<template>
    <div>
        <div id="main"></div>
        <div class="region" style="width:300px;height:300px; border: 1px red solid;">
            <!-- <img src="@/images/cir.gif" alt=""> -->
            <div class="dot"></div>
            <div class="place"></div>
        </div>
    </div>
</template>
<script>
import * as echarts from 'echarts';
// 请确保在引入百度地图扩展之前已经引入百度地图 JS API 脚本并成功加载
// https://api.map.baidu.com/api?v=3.0&ak=你申请的AK
import 'echarts/extension/bmap/bmap';
export default {
    data() {
        return {
            //此处不声明 map 对象，可以直接使用 this.map赋值或者采用非响应式的普通对象来存储。
            //map:null,
        }
    },
    mounted() {
        //DOM初始化完成进行地图初始化
        // this.initMap();
        this.cir()
    },
    methods: {
        initMap() {

            var chartDom = document.getElementById('main');
            var myChart = echarts.init(chartDom);
            var option;

            const data = [
                { name: '海门', value: 9 },
                { name: '鄂尔多斯', value: 12 },
                { name: '招远', value: 12 },
                { name: '舟山', value: 12 },
                { name: '齐齐哈尔', value: 14 },
                { name: '盐城', value: 15 },
                { name: '赤峰', value: 16 },
                { name: '青岛', value: 18 },
                { name: '乳山', value: 18 },
                { name: '金昌', value: 19 },
                { name: '泉州', value: 21 },
                { name: '莱西', value: 21 },
                { name: '日照', value: 21 },
                { name: '胶南', value: 22 },
                { name: '南通', value: 23 },
                { name: '拉萨', value: 24 },
                { name: '云浮', value: 24 },
                { name: '梅州', value: 25 },
                { name: '文登', value: 25 },
                { name: '上海', value: 25 },
                { name: '攀枝花', value: 25 },
                { name: '威海', value: 25 },
                { name: '承德', value: 25 },
                { name: '厦门', value: 26 },
                { name: '汕尾', value: 26 },
                { name: '潮州', value: 26 },
                { name: '丹东', value: 27 },
                { name: '太仓', value: 27 },
                { name: '曲靖', value: 27 },
                { name: '烟台', value: 28 },
                { name: '福州', value: 29 },
                { name: '瓦房店', value: 30 },
                { name: '即墨', value: 30 },
                { name: '抚顺', value: 31 },
                { name: '玉溪', value: 31 },
                { name: '张家口', value: 31 },
                { name: '阳泉', value: 31 },
                { name: '莱州', value: 32 },
                { name: '湖州', value: 32 },
                { name: '汕头', value: 32 },
                { name: '昆山', value: 33 },
                { name: '宁波', value: 33 },
                { name: '湛江', value: 33 },
                { name: '揭阳', value: 34 },
                { name: '荣成', value: 34 },
                { name: '连云港', value: 35 },
                { name: '葫芦岛', value: 35 },
                { name: '常熟', value: 36 },
                { name: '东莞', value: 36 },
                { name: '河源', value: 36 },
                { name: '淮安', value: 36 },
                { name: '泰州', value: 36 },
                { name: '南宁', value: 37 },
                { name: '营口', value: 37 },
                { name: '惠州', value: 37 },
                { name: '江阴', value: 37 },
                { name: '蓬莱', value: 37 },
                { name: '韶关', value: 38 },
                { name: '嘉峪关', value: 38 },
                { name: '广州', value: 38 },
                { name: '延安', value: 38 },
                { name: '太原', value: 39 },
                { name: '清远', value: 39 },
                { name: '中山', value: 39 },
                { name: '昆明', value: 39 },
                { name: '寿光', value: 40 },
                { name: '盘锦', value: 40 },
                { name: '长治', value: 41 },
                { name: '深圳', value: 41 },
                { name: '珠海', value: 42 },
                { name: '宿迁', value: 43 },
                { name: '咸阳', value: 43 },
                { name: '铜川', value: 44 },
                { name: '平度', value: 44 },
                { name: '佛山', value: 44 },
                { name: '海口', value: 44 },
                { name: '江门', value: 45 },
                { name: '章丘', value: 45 },
                { name: '肇庆', value: 46 },
                { name: '大连', value: 47 },
                { name: '临汾', value: 47 },
                { name: '吴江', value: 47 },
                { name: '石嘴山', value: 49 },
                { name: '沈阳', value: 50 },
                { name: '苏州', value: 50 },
                { name: '茂名', value: 50 },
                { name: '嘉兴', value: 51 },
                { name: '长春', value: 51 },
                { name: '胶州', value: 52 },
                { name: '银川', value: 52 },
                { name: '张家港', value: 52 },
                { name: '三门峡', value: 53 },
                { name: '锦州', value: 54 },
                { name: '南昌', value: 54 },
                { name: '柳州', value: 54 },
                { name: '三亚', value: 54 },
                { name: '自贡', value: 56 },
                { name: '吉林', value: 56 },
                { name: '阳江', value: 57 },
                { name: '泸州', value: 57 },
                { name: '西宁', value: 57 },
                { name: '宜宾', value: 58 },
                { name: '呼和浩特', value: 58 },
                { name: '成都', value: 58 },
                { name: '大同', value: 58 },
                { name: '镇江', value: 59 },
                { name: '桂林', value: 59 },
                { name: '张家界', value: 59 },
                { name: '宜兴', value: 59 },
                { name: '北海', value: 60 },
                { name: '西安', value: 61 },
                { name: '金坛', value: 62 },
                { name: '东营', value: 62 },
                { name: '牡丹江', value: 63 },
                { name: '遵义', value: 63 },
                { name: '绍兴', value: 63 },
                { name: '扬州', value: 64 },
                { name: '常州', value: 64 },
                { name: '潍坊', value: 65 },
                { name: '重庆', value: 66 },
                { name: '台州', value: 67 },
                { name: '南京', value: 67 },
                { name: '滨州', value: 70 },
                { name: '贵阳', value: 71 },
                { name: '无锡', value: 71 },
                { name: '本溪', value: 71 },
                { name: '克拉玛依', value: 72 },
                { name: '渭南', value: 72 },
                { name: '马鞍山', value: 72 },
                { name: '宝鸡', value: 72 },
                { name: '焦作', value: 75 },
                { name: '句容', value: 75 },
                { name: '北京', value: 79 },
                { name: '徐州', value: 79 },
                { name: '衡水', value: 80 },
                { name: '包头', value: 80 },
                { name: '绵阳', value: 80 },
                { name: '乌鲁木齐', value: 84 },
                { name: '枣庄', value: 84 },
                { name: '杭州', value: 84 },
                { name: '淄博', value: 85 },
                { name: '鞍山', value: 86 },
                { name: '溧阳', value: 86 },
                { name: '库尔勒', value: 86 },
                { name: '安阳', value: 90 },
                { name: '开封', value: 90 },
                { name: '济南', value: 92 },
                { name: '德阳', value: 93 },
                { name: '温州', value: 95 },
                { name: '九江', value: 96 },
                { name: '邯郸', value: 98 },
                { name: '临安', value: 99 },
                { name: '兰州', value: 99 },
                { name: '沧州', value: 100 },
                { name: '临沂', value: 103 },
                { name: '南充', value: 104 },
                { name: '天津', value: 105 },
                { name: '富阳', value: 106 },
                { name: '泰安', value: 112 },
                { name: '诸暨', value: 112 },
                { name: '郑州', value: 113 },
                { name: '哈尔滨', value: 114 },
                { name: '聊城', value: 116 },
                { name: '芜湖', value: 117 },
                { name: '唐山', value: 119 },
                { name: '平顶山', value: 119 },
                { name: '邢台', value: 119 },
                { name: '德州', value: 120 },
                { name: '济宁', value: 120 },
                { name: '荆州', value: 127 },
                { name: '宜昌', value: 130 },
                { name: '义乌', value: 132 },
                { name: '丽水', value: 133 },
                { name: '洛阳', value: 134 },
                { name: '秦皇岛', value: 136 },
                { name: '株洲', value: 143 },
                { name: '石家庄', value: 147 },
                { name: '莱芜', value: 148 },
                { name: '常德', value: 152 },
                { name: '保定', value: 153 },
                { name: '湘潭', value: 154 },
                { name: '金华', value: 157 },
                { name: '岳阳', value: 169 },
                { name: '长沙', value: 175 },
                { name: '衢州', value: 177 },
                { name: '廊坊', value: 193 },
                { name: '菏泽', value: 194 },
                { name: '合肥', value: 229 },
                { name: '武汉', value: 273 },
                { name: '大庆', value: 279 }
            ];
            const geoCoordMap = {
                海门: [121.15, 31.89],
                鄂尔多斯: [109.781327, 39.608266],
                招远: [120.38, 37.35],
                舟山: [122.207216, 29.985295],
                齐齐哈尔: [123.97, 47.33],
                盐城: [120.13, 33.38],
                赤峰: [118.87, 42.28],
                青岛: [120.33, 36.07],
                乳山: [121.52, 36.89],
                金昌: [102.188043, 38.520089],
                泉州: [118.58, 24.93],
                莱西: [120.53, 36.86],
                日照: [119.46, 35.42],
                胶南: [119.97, 35.88],
                南通: [121.05, 32.08],
                拉萨: [91.11, 29.97],
                云浮: [112.02, 22.93],
                梅州: [116.1, 24.55],
                文登: [122.05, 37.2],
                上海: [121.48, 31.22],
                攀枝花: [101.718637, 26.582347],
                威海: [122.1, 37.5],
                承德: [117.93, 40.97],
                厦门: [118.1, 24.46],
                汕尾: [115.375279, 22.786211],
                潮州: [116.63, 23.68],
                丹东: [124.37, 40.13],
                太仓: [121.1, 31.45],
                曲靖: [103.79, 25.51],
                烟台: [121.39, 37.52],
                福州: [119.3, 26.08],
                瓦房店: [121.979603, 39.627114],
                即墨: [120.45, 36.38],
                抚顺: [123.97, 41.97],
                玉溪: [102.52, 24.35],
                张家口: [114.87, 40.82],
                阳泉: [113.57, 37.85],
                莱州: [119.942327, 37.177017],
                湖州: [120.1, 30.86],
                汕头: [116.69, 23.39],
                昆山: [120.95, 31.39],
                宁波: [121.56, 29.86],
                湛江: [110.359377, 21.270708],
                揭阳: [116.35, 23.55],
                荣成: [122.41, 37.16],
                连云港: [119.16, 34.59],
                葫芦岛: [120.836932, 40.711052],
                常熟: [120.74, 31.64],
                东莞: [113.75, 23.04],
                河源: [114.68, 23.73],
                淮安: [119.15, 33.5],
                泰州: [119.9, 32.49],
                南宁: [108.33, 22.84],
                营口: [122.18, 40.65],
                惠州: [114.4, 23.09],
                江阴: [120.26, 31.91],
                蓬莱: [120.75, 37.8],
                韶关: [113.62, 24.84],
                嘉峪关: [98.289152, 39.77313],
                广州: [113.23, 23.16],
                延安: [109.47, 36.6],
                太原: [112.53, 37.87],
                清远: [113.01, 23.7],
                中山: [113.38, 22.52],
                昆明: [102.73, 25.04],
                寿光: [118.73, 36.86],
                盘锦: [122.070714, 41.119997],
                长治: [113.08, 36.18],
                深圳: [114.07, 22.62],
                珠海: [113.52, 22.3],
                宿迁: [118.3, 33.96],
                咸阳: [108.72, 34.36],
                铜川: [109.11, 35.09],
                平度: [119.97, 36.77],
                佛山: [113.11, 23.05],
                海口: [110.35, 20.02],
                江门: [113.06, 22.61],
                章丘: [117.53, 36.72],
                肇庆: [112.44, 23.05],
                大连: [121.62, 38.92],
                临汾: [111.5, 36.08],
                吴江: [120.63, 31.16],
                石嘴山: [106.39, 39.04],
                沈阳: [123.38, 41.8],
                苏州: [120.62, 31.32],
                茂名: [110.88, 21.68],
                嘉兴: [120.76, 30.77],
                长春: [125.35, 43.88],
                胶州: [120.03336, 36.264622],
                银川: [106.27, 38.47],
                张家港: [120.555821, 31.875428],
                三门峡: [111.19, 34.76],
                锦州: [121.15, 41.13],
                南昌: [115.89, 28.68],
                柳州: [109.4, 24.33],
                三亚: [109.511909, 18.252847],
                自贡: [104.778442, 29.33903],
                吉林: [126.57, 43.87],
                阳江: [111.95, 21.85],
                泸州: [105.39, 28.91],
                西宁: [101.74, 36.56],
                宜宾: [104.56, 29.77],
                呼和浩特: [111.65, 40.82],
                成都: [104.06, 30.67],
                大同: [113.3, 40.12],
                镇江: [119.44, 32.2],
                桂林: [110.28, 25.29],
                张家界: [110.479191, 29.117096],
                宜兴: [119.82, 31.36],
                北海: [109.12, 21.49],
                西安: [108.95, 34.27],
                金坛: [119.56, 31.74],
                东营: [118.49, 37.46],
                牡丹江: [129.58, 44.6],
                遵义: [106.9, 27.7],
                绍兴: [120.58, 30.01],
                扬州: [119.42, 32.39],
                常州: [119.95, 31.79],
                潍坊: [119.1, 36.62],
                重庆: [106.54, 29.59],
                台州: [121.420757, 28.656386],
                南京: [118.78, 32.04],
                滨州: [118.03, 37.36],
                贵阳: [106.71, 26.57],
                无锡: [120.29, 31.59],
                本溪: [123.73, 41.3],
                克拉玛依: [84.77, 45.59],
                渭南: [109.5, 34.52],
                马鞍山: [118.48, 31.56],
                宝鸡: [107.15, 34.38],
                焦作: [113.21, 35.24],
                句容: [119.16, 31.95],
                北京: [116.46, 39.92],
                徐州: [117.2, 34.26],
                衡水: [115.72, 37.72],
                包头: [110, 40.58],
                绵阳: [104.73, 31.48],
                乌鲁木齐: [87.68, 43.77],
                枣庄: [117.57, 34.86],
                杭州: [120.19, 30.26],
                淄博: [118.05, 36.78],
                鞍山: [122.85, 41.12],
                溧阳: [119.48, 31.43],
                库尔勒: [86.06, 41.68],
                安阳: [114.35, 36.1],
                开封: [114.35, 34.79],
                济南: [117, 36.65],
                德阳: [104.37, 31.13],
                温州: [120.65, 28.01],
                九江: [115.97, 29.71],
                邯郸: [114.47, 36.6],
                临安: [119.72, 30.23],
                兰州: [103.73, 36.03],
                沧州: [116.83, 38.33],
                临沂: [118.35, 35.05],
                南充: [106.110698, 30.837793],
                天津: [117.2, 39.13],
                富阳: [119.95, 30.07],
                泰安: [117.13, 36.18],
                诸暨: [120.23, 29.71],
                郑州: [113.65, 34.76],
                哈尔滨: [126.63, 45.75],
                聊城: [115.97, 36.45],
                芜湖: [118.38, 31.33],
                唐山: [118.02, 39.63],
                平顶山: [113.29, 33.75],
                邢台: [114.48, 37.05],
                德州: [116.29, 37.45],
                济宁: [116.59, 35.38],
                荆州: [112.239741, 30.335165],
                宜昌: [111.3, 30.7],
                义乌: [120.06, 29.32],
                丽水: [119.92, 28.45],
                洛阳: [112.44, 34.7],
                秦皇岛: [119.57, 39.95],
                株洲: [113.16, 27.83],
                石家庄: [114.48, 38.03],
                莱芜: [117.67, 36.19],
                常德: [111.69, 29.05],
                保定: [115.48, 38.85],
                湘潭: [112.91, 27.87],
                金华: [119.64, 29.12],
                岳阳: [113.09, 29.37],
                长沙: [113, 28.21],
                衢州: [118.88, 28.97],
                廊坊: [116.7, 39.53],
                菏泽: [115.480656, 35.23375],
                合肥: [117.27, 31.86],
                武汉: [114.31, 30.52],
                大庆: [125.03, 46.58]
            };
            const convertData = function (data) {
                var res = [];
                for (var i = 0; i < data.length; i++) {
                    var geoCoord = geoCoordMap[data[i].name];
                    if (geoCoord) {
                        res.push({
                            name: data[i].name,
                            value: geoCoord.concat(data[i].value)
                        });
                    }
                }
                return res;
            };
            option = {
                title: {
                    text: '全国主要城市空气质量 - 百度地图',
                    subtext: 'data from PM25.in',
                    sublink: 'http://www.pm25.in',
                    left: 'center'
                },
                tooltip: {
                    trigger: 'item'
                },
                bmap: {
                    center: [104.114129, 37.550339],
                    zoom: 5,
                    roam: true,
                    mapStyle: {
                        styleJson: [
                            {
                                featureType: 'water',
                                elementType: 'all',
                                stylers: {
                                    color: '#d1d1d1'
                                }
                            },
                            {
                                featureType: 'land',
                                elementType: 'all',
                                stylers: {
                                    color: '#f3f3f3'
                                }
                            },
                            {
                                featureType: 'railway',
                                elementType: 'all',
                                stylers: {
                                    visibility: 'off'
                                }
                            },
                            {
                                featureType: 'highway',
                                elementType: 'all',
                                stylers: {
                                    color: '#fdfdfd'
                                }
                            },
                            {
                                featureType: 'highway',
                                elementType: 'labels',
                                stylers: {
                                    visibility: 'off'
                                }
                            },
                            {
                                featureType: 'arterial',
                                elementType: 'geometry',
                                stylers: {
                                    color: '#fefefe'
                                }
                            },
                            {
                                featureType: 'arterial',
                                elementType: 'geometry.fill',
                                stylers: {
                                    color: '#fefefe'
                                }
                            },
                            {
                                featureType: 'poi',
                                elementType: 'all',
                                stylers: {
                                    visibility: 'off'
                                }
                            },
                            {
                                featureType: 'green',
                                elementType: 'all',
                                stylers: {
                                    visibility: 'off'
                                }
                            },
                            {
                                featureType: 'subway',
                                elementType: 'all',
                                stylers: {
                                    visibility: 'off'
                                }
                            },
                            {
                                featureType: 'manmade',
                                elementType: 'all',
                                stylers: {
                                    color: '#d1d1d1'
                                }
                            },
                            {
                                featureType: 'local',
                                elementType: 'all',
                                stylers: {
                                    color: '#d1d1d1'
                                }
                            },
                            {
                                featureType: 'arterial',
                                elementType: 'labels',
                                stylers: {
                                    visibility: 'off'
                                }
                            },
                            {
                                featureType: 'boundary',
                                elementType: 'all',
                                stylers: {
                                    color: '#fefefe'
                                }
                            },
                            {
                                featureType: 'building',
                                elementType: 'all',
                                stylers: {
                                    color: '#d1d1d1'
                                }
                            },
                            {
                                featureType: 'label',
                                elementType: 'labels.text.fill',
                                stylers: {
                                    color: '#999999'
                                }
                            }
                        ]
                    }
                },
                series: [
                    {
                        name: 'pm2.5',
                        type: 'scatter',
                        coordinateSystem: 'bmap',
                        data: convertData(data),
                        symbolSize: function (val) {
                            return val[2] / 10;
                        },
                        encode: {
                            value: 2
                        },
                        label: {
                            formatter: '{b}',
                            position: 'right',
                            show: false
                        },
                        emphasis: {
                            label: {
                                show: true
                            }
                        }
                    },
                    {
                        name: 'Top 5',
                        type: 'effectScatter',
                        coordinateSystem: 'bmap',
                        data: convertData(
                            data
                                .sort(function (a, b) {
                                    return b.value - a.value;
                                })
                                .slice(0, 6)
                        ),
                        symbolSize: function (val) {
                            return val[2] / 10;
                        },
                        encode: {
                            value: 2
                        },
                        showEffectOn: 'render',
                        rippleEffect: {
                            brushType: 'stroke'
                        },
                        label: {
                            formatter: '{b}',
                            position: 'right',
                            show: true
                        },
                        itemStyle: {
                            shadowBlur: 10,
                            shadowColor: '#333'
                        },
                        emphasis: {
                            scale: true
                        },
                        zlevel: 1
                    }
                ]
            };

            option && myChart.setOption(option);

        },
        cir() {
            //画圆
            var drawCircle = function () {
                context.beginPath();
                context.arc(150, 100, radius, 0, Math.PI * 2);
                context.closePath();
                context.lineWidth = 2; //线条宽度
                context.strokeStyle = 'rgba(250,250,50,1)'; //颜色
                context.stroke();
                radius += 0.5; //每一帧半径增加0.5

                //半径radius大于30时，重置为0
                if (radius > 30) {
                    radius = 0;
                }
            };
            //创建一个临时canvas来缓存主canvas的历史图像
            var backCanvas = document.createElement('canvas'),
                backCtx = backCanvas.getContext('2d');
            backCanvas.width = width;
            backCanvas.height = height;

            //设置主canvas的绘制透明度
            context.globalAlpha = 0.95;

            //显示即将绘制的图像，忽略临时canvas中已存在的图像
            backCtx.globalCompositeOperation = 'copy';

            var render = function () {
                //1.先将主canvas的图像缓存到临时canvas中
                backCtx.drawImage(canvas, 0, 0, width, height);

                //2.清除主canvas上的图像
                context.clearRect(0, 0, width, height);

                //3.在主canvas上画新圆
                drawCircle();

                //4.等新圆画完后，再把临时canvas的图像绘制回主canvas中
                context.drawImage(backCanvas, 0, 0, width, height);
            };
        }
    },
}
</script>
<style  scoped>
#main {
    padding: 0px;
    margin: 0px;
    width: 100%;
    height: 800px;
}
</style>